Dental Radiography Safety Flashcards
6 cards from real NDAEB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Dental Radiography Safety flashcards as text
When processing digital phosphor plate (PSP) radiographic images, what happens if the plates are not scanned within the recommended time after exposure?
Answer: The latent image fades, resulting in reduced image quality and potential need for retake
Phosphor plate images fade over time as the stored energy dissipates. Plates should be scanned within 5-10 minutes of exposure to maintain optimal image quality and avoid the need for retakes (which would increase patient dose).
A patient expresses concern about radiation exposure from dental X-rays. Which comparison would be most accurate to help them understand the relative risk?
Answer: A full-mouth series of dental radiographs delivers roughly the same radiation as 1-2 days of natural background radiation
A full-mouth series (approximately 0.150 mSv with digital sensors) is comparable to 1-2 days of natural background radiation that everyone receives from the environment (cosmic rays, radon, terrestrial sources), which averages about 2-3 mSv per year in Canada.
What is the correct sequence for infection control when handling digital sensors between patients?
Answer: Remove the plastic barrier, disinfect the sensor with an intermediate-level disinfectant, place a new barrier, and allow to dry
Digital sensors cannot be autoclaved as the heat would destroy the electronics. The protocol is: remove the disposable barrier carefully (avoiding contamination of the sensor), wipe and disinfect with an intermediate-level surface disinfectant, allow to dry, and apply a new barrier before the next patient.
Which quality assurance test should be performed regularly on dental X-ray equipment to ensure consistent image quality and radiation output?
Answer: Regular testing of output consistency, timer accuracy, and kVp accuracy, along with darkroom safelight testing for film-based systems
A comprehensive quality assurance program includes regular testing of X-ray output consistency, timer accuracy, kVp accuracy, beam alignment, and (for film systems) darkroom conditions. This ensures diagnostic image quality and proper patient radiation doses.
What is rectangular collimation, and why is it recommended over circular collimation for periapical radiography?
Answer: It restricts the X-ray beam to approximately the size of the image receptor, reducing the irradiated tissue volume by up to 60% compared to the standard circular collimator
Rectangular collimation restricts the X-ray beam to match the size of the image receptor (approximately 3 x 4 cm), eliminating unnecessary radiation to surrounding tissues. This reduces the irradiated area and patient dose by up to 60% compared to the standard round 7 cm diameter collimator.
A dental assistant accidentally exposes a radiograph without placing the image receptor in the patient's mouth. What should they do?
Answer: Acknowledge the error, do NOT record it as a diagnostic exposure, document the incident as per office policy, and take the correct exposure with the receptor in place
An accidental exposure without the receptor is a retake that results in unnecessary patient radiation. The incident should be acknowledged, documented per office policy (for QA tracking), and the correct exposure taken. Honest error reporting is essential for quality improvement.